The rules included with the Necromunda: Underhive boxed game cover battles set in the claustrophobic tunnels beneath the hives – but gangs also clash above ground, amid sprawling machinery that fills vast domes from ground to ceiling. Necromunda: Gang War is a set of rules that allow the players to use 3D terrain in their games, bringing a literal new dimension to their battles – and also an incredibly detailed campaign system, in which 2-6 (or more!) players develop their gangs, fight for territory and dominate the other Houses.

Gang Wars in the Sector Mechanicus: this section is a set of advanced rules, covering the use of Citadel Sector Mechanicus scenery – or any 3-dimensional scenery pieces, with special rules for Zone Mortalis boards – in building your own bespoke battlegrounds. These rules do not cover specific terrain pieces, rather defining different types of terrain, meaning no adaptation should ever be needed. Included are new rules for line of sight, crossing obstacles, falling hazards, railings, slowed movement, climbing, overhangs, jumping downwards, traversing gaps and falling.

Campaigns: this section contains rules and guidelines for running a Necromunda campaign – a series of linked games which let players build their gang from newcomers to conquering destroyers, fending off threats from rivals and claiming territory in Turf Wars. This includes:

The basic structure of a campaign, showing you how to found a gang using the included blank roster sheet, how to accrue and use experience to add skills and abilities to your fighters, how injuries and capturing enemies work during games, and fleeing the battlefield

Pre-battle sequence: limbering up before a Turf War is incredibly important, and this section will walk you through buying advancements and hired guns for your gang, determining the scenario to be played, crew selection and deployment

Post-battle sequence: how to determine victory and wrap up your game, divvy up the income gained from your exploits, receive rewards, increase (or decrease) your gang’s Turf, gain and lose reputation, visit trading posts to sell your spoils and seek out new and rare equipment, and retrieve injured fighters from the battlefield before updating your gang’s roster

Apotheosis: this is a set of extra rules that come into play at the climax of a campaign, representing the escalating clashes across the zones

Downtime: your gangs don’t rest when you do – this is a set of rules that come into play while your campaign is on hold, allowing your fighters time to prepare, recover and gird their loins for the next Turf War

A campaign reference, featuring easy to follow tables with which to quickly enforce many campaign rules, including lists of gear that can be found at the trading posts, an Armoury and quick-reference tables for the myriad skills and abilities available

House lists for Escher and Goliath gangs, containing all the information needed to assemble a complete gang of either House. This replaces the ‘Founding a Gang’ section from the Necromunda: Underhive rulebook entirely

6 scenarios, which can be used for campaign or skirmish battles, which work with Sector Mechanicus scenery and Zone Mortalis boards